Well-casing shoe.



CTI

REUBEN ofBAKER, or ooALrNGA, oALrFoRiuA.

, I A wnnnonsme SHOE.

no. seams.

Specification of Letters lPatent.

Patented July 16, 1907.

Application filed April 22, 1907. Serial No. 369,588-

'To all whom it may concern:

Be it known that l, REUBEN C. BAKER, a citizen of the United States,residing at Coalinga, in the county' ol Fresno and State ol California,have `invented a new and useful Well-Casing Shoe, of which the followingis a specification.

This invention relates to improvementsin apparatus for drilling Artesianwells, and it has for its object to provide an improved shoe or tooladapted to be attached to the Well casing or the boring tube, and havinga series ol cutters thereon adapted to operate on'the walls of arelatively small bore, such as is formed by the usual boring tool, andenlarge it to receive the well casing, 'the cutters on the shoe or toolbeing so shaped as to afford sufficient clearance between the bore andthe casing to permit the latter to be readily introduced in the well,the construction of the device being such that it may be made at asmall. cost.

, pose oi rezoning or enlarging the bore formed by the ordi- ,bekpositively iriitted slimme serres es a Stop Vo To these and other ends,the invention comprises the various novel features of construction andarrangement l of parts, which ivill be hereinafter more fully describedand pointed out particularly in the claims appended hereto` i Intheaccornpanying drawingz-Figurel is a sectional view of the lower endol' the well casing havingY end of the well casing when the latter isoperated as a part of the boring apparatus, or it may be attached to theusual boring tube, and it is employed for the purnary boring tool orchisel,` thereby sizing the Well bore to receive the Well seasing.

The shoe or tool shown in the present instance is composed of asubstantially cylindrical shell ll made of tool steel or other suitablematerial andlis provided .with suitable means for attaching it to thewellcasing or other operating part, the means shown in the presentinstance embodying screw threads 2 formed on the in- .terior of theshell at a point intermediate its ends, and

` toward the lower end of the shell is formed an 'annular slvioulde` 3wl:u', :hv Aprojects inwardly from the bore of $11 l and isi4 adapted.to vCooperate with the lower e well-easing or'operating part' 4 os astopv lrees Aactingl.longitudinally of theipart will "to theshoeor toolthe vent the casing or other part from becoming too tight on the screwthreads, especially when a relative rotary movement is transmittedbetween the well casing, o1' other part, and the shoe or tool. Thisshoulder also provides a relatively thick portion on the shell on whichthe cutters-are formed; and the lower end of the thickened portionpf theshell is llared'outwardly, as at 5. The cutters em` ployed in thepresentinstance embody a'series of concentrically arranged teeth 6 that are ofsubstantially prismatic form, and those shown in the present instancemay be readily formed by milling a series o slots 7 radially of theshell, forming iront and rear cutting edges' 8 and 9, and the innersides of the teeth are beveled to forni a lower cutting edged() at thelower endof the shell, the flared form of the shell causing the outercutter edges l0 to project beyond the outer wall of the shell, and inoperation serves to afford ample clearanceor the body of the shell andthe Well casing.l

The shoe -or tool ,shown in the present instance is operated by acombiried longitudinal and rotary movement'of the well casing or otheroperating part of the apparatus, the cutters constituting a series ofchisels i as the boring operation progresses, and the shoe or toolremains in'position at the bottom of the well, the construction shownbeing relatively simple so that the devices may be used at a small cost.The flared iorln of the shell at the point where the cutters are formedin surcs a sufficient clearance between the bore of the well and theexterior oi the well casing, as will permit the unions or other jointsemployed to pass into the well bore Without liability oi its becomingcaught, so thatV the operation oi applying the well casing isfacilitated.

1. A well boring tool of the character doschs., einbodying a shelladapted for attachment to a sx'l'ltible operating part and having itslower end ilared, and a series of cutters formacion the flared portionof the shell.

2. A wel) boring tool of the character described embodylng a shelladapted to be attached to a suitable operating part, the lower 'end ofthe shelly being ared outwardly 'and beveled at its inner side, and 'aseries or clrcularly nrrsnged cutters having cutting edges formed on theIlm-,ed

portion' of the shell. ,t l,

. y l 3. A well boring vtool, of the' character described embodyingashell adapted to he attached to asuitable operating port, the lowerportion of the shell being provided with :rshoulder extending around theinside thereof, the lower casing, the lower end of the shell beingbeveled inwardly r portion ot the shell, being ared outwardly andprovided vvj/ith a'beveed surface extending A inwardly from the tingedportion, and a series of circularly arranged cutters formed on theflared portion ofthe shell.

4. A well boring tool of the chara'cter diesel-ined` embodylng s.substantially cylindrical shell having its lower end lured outwardly, anannular shoulder formed at the lower pogtion 'of `the shellnthreadsformed in the bore of the Blll'l stie., nontzillfe theshoulder endadvapted to comprate with zi-oorrespondlngly threaded end of the wellfrom the ared portion and provided with substantially radial slotsforming a series of cutters on the lower flared end of the shell.

In testimony that I claim the foregoing as my own, l have hereto affixedmy signature'ln the 'presence of two Witnesses. l

' REUBEN C. BAKER.

Witnesses:

kJ. E. LACEY, IH. HENSHAW.

